Instrument for squaring stone, &amp;c.



No. 781,749. PATBNTED FEB. '7, 1905. P. T. STEVENS.

INSTRUMENT FOR SQUARING STONE, &0.

APPLICATION FILED 0GT.9. 1903.

Patented February 7, 1905.

E R E D T S"EVENS, ()E BRYANT POND, MAINE.

INSTRUMENT FOR SQUARING STONE, 800.

SPECIFICATION forming part of Letters Patent No. 781,749, dated February '7, 1905.

Application filed October 9,1903. Serial No. 176,341.

ful Improvements in Instruments for Squarl ing Stone, &c., of which the following is a specilicatioi'i.

My invention relates to an instrument by which may be described or marked off correctly for dressing purposes stone, wood, iron, or any like material where a perfect plane right-angle batter or incline is required.

In dressing rectangular stone it is customary to lirst cut two adjacent edges and then cut the other two edges in the same plane. To get the last two edges in the same plane as the lirst two is not an easy thing to do, and it is commonly done by sighting across straight-edgesan inaccurate method.

My invention is designed to locate parallel edges in the same plane with each other by measuring their inclination to the horizon.

.It consists, essentially, of an elongated base, to which is pivoted an arm normally parallel with the base, this arm being provided with one or more spirit-levels and means for clamping the arm in various positions.

1 illustrate my invention by means of the accompanying drawings, in which- Figure 1 is a side elevation, and Fig. 2 is a plan of my tool or instrument.

A is an elongated base provided with perforated lugs adapted to attach it to a straightedge, and (J is an arm pivoted to the base and normally resting on it and parallel with it. The arm C is provided with a horizontal spirit-level (Z and a vertical level L, both being at or near the end of the arm.

Means are provided for clamping the arm at any desired angle with the base and for this purpose, as here shown, 1 form a segment B, integral with the base and extending The instrument is used as follows: In cutting stone after the two adjacent edges are cut the base is laid on one of the edges either directly or attached to a straight-edge, and if it is not perfectly level the arm is raised until it is level. The instrument is then shifted to the opposite and parallel edge, and if the am: is still level the two edges are in the same plane that is, they are at the same angle with the horizon. Thus parallel edges may be tested on timber, iron, or any like material. if the edge to be cut is at right angles in a vertical plane, the implement turned up so that the level is central. Thus in cut-- ting a rectangular stone all of the faces can be squared by the use of my device applied from one edge to the corresponding parallel edge and the right-angle edges. It is simple in construction and may be cheaply made, and when the segment is properly marked or graduated any desired batter or incline may be described, thus making the uses of the instrument numerous.

It will be understood that the graduation of the segment may be such that either the angle may be read or the number of inches of inclination or batter per foot which the angle will give. \Vhen thus graduated, the instrument will work equally well with a batter as with plane work.

I clain1- The llOI'Qll'l-(lGSCllbGtl instrument, consisting of an elongated base A, a segment secured thereto and exteiuling vertically upward therefrom, said segment being provided with a curved slot through the body thereof 'parallelwith the curvature of the segment, an arm pivotally secured near the apex of the segment provided with a head having recesses or depressions at right angles to each other, one upon the outer face of the end and one upon the top face of the end, a horizontal spirit-level mounted in the depression upon the top face of the end, and a vertical spiritlevel mounted in the other depression, and a clamping means passing through and slidable iii said slot and engaging said arm intermediate of its length for holding the arm in the proper position relative to the segment, said Signed at Bryant Pond, Maine, this 11th clamping means comprising a plate adapted day of September, 1903.

to contact the segment opposite the slot, a 1

threaded member passing through the slot FRED STEVENS and arm, and a thumb-nut mounted upon said WVitnesses: member adapted to engage the arm and clamp it and the segment together.

A. MONT CHASE, ARTHUR C. RIoKuR. 

